From what I've read in the past (and from experience with my old RX-7), the seals in the N/A rotaries seem to hold up really well.
Heck, even in a stock Turbo 13B, they do ok. It's once people start modifying them, and once the engine begins to run lean, then the engines will begin to break down the seals.
1973 Opel GT
2002 Suzuki SV650